Scaffold cross-bar and stack arrangement of at least two scaffold cross-bars

ABSTRACT

A scaffold cross-bar of metal with a round-tube carrier profile of steel includes a round tube and has an outside diameter, and a U-shaped reinforcing profile of steel sheet. The U-shaped reinforcing profile has a base profile and two parallel profile legs which extend away from the base profile in the same direction at a transverse spacing from one another. Each profile leg has at least one opening for fastening and/or securing scaffold components on the scaffold cross-bar. The transverse spacing of the profile legs is smaller than 0.6 times the outside diameter of the round-tube carrier profile.

The invention relates to a scaffolding bar of metal with an elongate,rod-shaped, preferably substantially straight, round-tube girder profilemember of steel and an elongate, preferably substantially straight, Ureinforcing profile member of sheet steel and further relates to a stackarrangement of at least two scaffolding bars of that kind.

Scaffolding bars of that kind have become known from, for example, U.S.Pat. No. 4,671,382, particularly FIGS. 8 and 9. These scaffolding barscomprise a round tube widened at each of its two tube ends, which faceaway from one another, to form a slotted connecting head producedintegrally from the round tube. The respective connecting head can beplugged by means of a plug-on slot onto an apertured disc of thescaffolding post and can be detachably fastened thereto with the help ofa connecting wedge. A U-shaped channel profile member closed at thelongitudinal sides thereof over the full circumference is fastened tothe round tube in such a way that the profile limbs, which extendparallel to one another and away from a base profile of the channelprofile member, of the channel profile member are fixedly welded to theouter circumferential wall of the round tube. The U-shaped channelprofile member has a channel profile member width which corresponds withthe transverse spacing of the two profile limbs and which is greaterthan the outer diameter of the round tube.

Similar scaffolding bars have also become known from practice and fromthe product brochure of the applicant ‘Catalogue and Price List’ for the‘Layher Allround scaffolding system’, issue Jan. 3, 2007, in the form ofthe scaffolding bar shown therein on page 8 and termed ‘O bar,reinforced’. This scaffolding bar comprises a round tube and areinforcing profile member which is fixedly welded thereto and has atriangular cross-section. Accordingly, the reinforcing profile membercan be termed V reinforcing profile member. The round-tube girderprofile member and the V reinforcing profile member consist of a steelmaterial having a yield strength of approximately 320 N/mm².

Although the afore-mentioned scaffolding bars of the Applicant haveproved best in practice, it has shown that these scaffolding bars incertain circumstances of use, for example in the case of larger spanwidths, do not satisfy the applicable requirements for a higher bendingstrength or load-bearing capability. Accordingly, the Applicant hasdeveloped and supplied so-called ‘O double bars, steel’, which aresimilarly illustrated in the afore-mentioned product brochure of theApplicant on page 8. These ‘O double bars’ have also proved best inpractice. They have an upper chord O profile member in the form of around tube of steel, to each of the ends of which facing away from oneanother is fixedly welded a respective connecting head, and have areinforcing lower chord O profile member which projects downwardly fromthe upper chord O profile member and which is similarly in the form of around tube of steel. The short designation ‘O double bar’ results fromthe use of the said two round tubes of this scaffolding bar. The lowerchord O profile member is fixedly welded, by the ends of its round tubeparts upwardly angled at either end, to the round tube of the upperchord. The round tube of the lower chord is connected by welding withthe round tube of the upper chord by way of several apertured supportplates of steel, which are arranged at a mutual spacing in longitudinaldirection of this scaffolding bar and which each impart a verticalspacing. The round tube of the upper chord, the round tube of the lowerchord and the support plates similarly consist of a steel materialhaving a yield strength of approximately 320 N/mm². An ‘O double bar’ ofthat kind does indeed have a greater bending strength or load-bearingcapability by comparison with the afore-mentioned ‘O bar, reinforced’,but has a significantly greater overall height. This has the consequencethat in the case of intended installation of a ‘O double bar’ of thatkind in scaffolding in which the connecting heads of the ‘O double bar’are secured to horizontally adjacent apertured discs—which are arrangedat substantially the same height—of two scaffolding posts, which arearranged or erected to be horizontally adjacent, at the level of thescaffolding floor of a next storey, the walk-through height iscorrespondingly reduced by the comparatively substantially downwardlyprojecting lower chord O profile member. This can lead to hindrance tothe passage of persons walking on the ground or on the scaffolding floorof a lower storey. Apart from these disadvantages, ‘O double bars’ ofthat kind are comparatively costly and have a comparatively largeweight.

Accordingly, the Applicant has, inter alia, expedited furtherdevelopments in the form of scaffolding bars of the kind stated in theintroduction, which are disclosed in German Patent Application No. 102014 100 498.1, which is still unpublished at the priority date of thepresent application, and in parallel International applicationPCT/DE2014/100433, which is similarly still unpublished at the prioritydate of the present application, in each instance particularly in FIGS.9 and 10 and in the associated parts of the description. A U reinforcingprofile member, which is closed at the longitudinal sides thereof overthe entire circumference and which has a U-shaped cross-section, withfastening ends—which are respectively bent over inwardly or bent overoutwardly—of its U profile limbs extending substantially parallel to oneanother is fixedly welded to the outer circumferential wall of the roundtube, which forms a girder profile member, of the scaffolding bar. Thetwo U profile limbs are each flanged or bent over through 90 degreesfrom a base profile of the U reinforcing profile member and respectivelyextend perpendicularly away from the base profile. In the embodimentsillustrated and described there, the outer diameter of the round-tubegirder profile member is 48.3 millimetres and the two U profile limbs ofthis U reinforcing profile member have a transverse spacing whichcorresponds with the U reinforcing profile member width and is 34millimetres.

In the case of the aforesaid scaffolding bars of the kind stated in theintroduction there is no or only limited possibility of fasteningexisting accessory components by couplings to the respective round-tubegirder profile member in a longitudinal region of the respectiveround-tube girder profile member, in which the respective U reinforcingprofile member also extends and of anti-lifting-off securing of at leastone existing scaffolding floor, which rests on or is suspended at theround-tube girder profile member, by means of a securing bar pivotableat the underside of the or the respective scaffolding floor relativethereto about a pivot axis arranged transversely, particularlyperpendicularly, to the work surface of the scaffolding floor. Moreover,a comparatively large stacking space is demanded in the case of alateral stacking of a number of scaffolding bars of that kind on oragainst one another.

It is accordingly an object of the invention to make available ascaffolding bar of the kind stated in the introduction which for evensimpler and comparatively more economic capability of production as wellas easier and safer manual handling and for a still relatively smalloverall height and a comparatively low weight has a comparatively largebending stiffness or load-bearing capability and offers favourablepossibilities for fastening and/or securing scaffolding components tothe scaffolding bar and also for space-saving transport or space-savingstorage of several scaffolding bars of that kind.

This object is fulfilled in unexpectedly simple mode and manner by thefeatures of claim 1.

Accordingly, the invention relates to a scaffolding bar of metal with anelongate rod-shaped round-tube girder profile member which is preferablysubstantially straight and which consists preferably exclusively ofa—especially substantially straight—round tube and an elongate,preferably straight—especially rod-shaped—U reinforcing profile memberof sheet steel, wherein the round-tube girder profile member extends inthe direction of a first longitudinal axis in a first longitudinaldirection, has, as considered in the first longitudinal direction, agirder profile member length and a girder profile member longitudinalcentre, has an outer diameter substantially constant over its girderprofile member length, has, as considered in an installed setting of thescaffolding bar, an upper support edge for support and/or suspension ofa scaffolding covering or a plurality of scaffolding coverings andcomprises two girder profile member ends facing away from one another inopposite directions in the first longitudinal direction, and whereineither a respective separate connecting head of metal, particularly ofmalleable cast iron, grey cast iron, cast steel or steel, for detachablefastening of the scaffolding bar in the installed setting to a fasteningelement, which is provided with at least one passage, of a scaffoldingelement by means of a connecting wedge insertable through the passage isfixedly welded to each girder profile member end of the girder profilemember ends or a respective hook-shaped suspension claw or suspensioncatch of metal, which is downwardly open as considered in each instancein the installed setting, for detachable support and/or suspension ofthe scaffolding bar in the installed setting on and/or at suspensioncomponents is fixedly welded to each girder profile end of the girderprofile ends, and wherein the U reinforcing profile member extends awayfrom the round-tube girder profile member to underneath the round-tubegirder profile member in the installed setting and extends in thedirection of a second longitudinal axis in a second longitudinaldirection, preferably rectilinearly, parallel to the round-tube girderprofile member and/or parallel to the first longitudinal axisthereof—with bridging-over of the girder-profile member longitudinalcentre—along the round-tube girder profile member continuously over areinforcing profile member length corresponding with at least half thegirder profile member length of the round-tube girder profile member,has two reinforcing profile member ends facing away from one another inopposite directions, has, as considered in a cross-section extendingperpendicularly to the second longitudinal axis, a U-shapedcross-section, is formed with a base profile, which extends in thesecond longitudinal direction and from which two lateral profile limbsextending in the second longitudinal direction extend away in the samedirection upwardly as considered in the installed setting andsubstantially parallel to one another at a transverse spacing and in thedirection of a profile limb axis, which is vertical in the installedsetting, and have fastening ends fixedly welded to an outer wall of theround-tube girder profile member, and has a reinforcing profile memberwidth corresponding with the transverse spacing and a reinforcingprofile member height, which corresponds with the spacing of thefastening ends from the base profile and which is greater than thereinforcing profile member width and greater than the outer diameter ofthe round-tube girder profile member; and wherein a first profile limbof the two lateral profile limbs is provided with a first passage forfastening and/or securing scaffolding components, which first passage isarranged at a first longitudinal spacing from a first reinforcingprofile member end of the two reinforcing profile member ends of the Ureinforcing profile member and at a second longitudinal spacing from a,second reinforcing profile member end of the two reinforcing profilemember ends of the U reinforcing profile member, has a first passagelength as considered in the second longitudinal direction and has afirst passage height which is smaller than the reinforcing profilemember height; and wherein a second profile limb of the two lateralprofile limbs is provided with a second passage for fastening and/orsecuring scaffolding components, which second passage is arranged at athird longitudinal spacing—preferably substantially corresponding withthe first longitudinal spacing—from the first reinforcing profile memberend of the U reinforcing profile member and at a fourth longitudinalspacing—preferably substantially corresponding with the secondlongitudinal spacing—from the second reinforcing profile member end, hasa second passage length—preferably substantially corresponding with thefirst passage length of the first passage—as considered in the secondlongitudinal direction and has a second passage height—preferablysubstantially corresponding with the first passage height of the firstpassage—smaller than the reinforcing profile member height; and whereinthe transverse spacing, which corresponds with the reinforcing profilemember width of the U reinforcing profile member, of the two lateralprofile limbs extending substantially parallel to one another is lessthan 0.6 times the outer diameter of the round-tube girder profilemember.

According to a particularly preferred embodiment it can be provided thatthe transverse spacing, which corresponds with the reinforcing profilemember width of the U reinforcing profile member, of the two lateralprofile limbs extending substantially parallel to one another is lessthan 0.5 or 0.45 times the outer diameter of the round-tube girderprofile member. The outer diameter of the round-tube girder profilemember can preferably be approximately 47 millimetres to 49 millimetres,particularly approximately 48.3 millimetres. The reinforcing profilemember width or the transverse spacing can preferably be, in particular,approximately 15 millimetres to 25 millimetres, particularlyapproximately 20 millimetres. As a result, an especially space-savingtransport or space-saving storage, particularly of several scaffoldingbars of that kind, is made possible.

According to an advantageous development it can be provided that thefirst passage of the first profile limb and the second passage of thesecond profile limb are arranged at substantially the same height withrespect to the U reinforcing profile member. This makes possible aparticularly advantageous fastening of accessory parts with couplings,in that a coupling part of the respective coupling can be inserted notonly through the first passage of the first profile limb, but alsothrough the second passage of the second profile limb of the Ureinforcing profile member.

According to a particularly preferred variant of embodiment it can beprovided that the first passage of the first profile limb and the secondpassage of the second profile limb of the U reinforcing profile memberare bounded by the outer wall of the round-tube girder profile member.As a result, in particularly advantageous mode and manner it is possiblefor accessory parts with couplings to be fastened to the round-tubegirder profile member in a length region of the round-tube girderprofile member in which this is provided with the U reinforcing profilemember by in each instance at least one coupling shell, particularly acoupling half shell.

According to a preferred development it can be provided that the firstpassage of the first profile limb as considered in a viewing directionperpendicular to a plane containing the first longitudinal axis and thesecond longitudinal axis either overlaps the second passage of thesecond profile limb of the U reinforcing profile member at least partlyor by more than half the passage area thereof or is substantiallyaligned with the second passage. As a result, a further improvement inthe sense of the preceding advantages can be achieved.

According to an advantageous embodiment it can be provided that thefirst profile limb of the U reinforcing profile member has in the regionof the first passage a first profile limb height which is greater thanhalf the reinforcing profile member height and that the second profilelimb of the U reinforcing profile member has in the region of the secondpassage a second profile limb height which is greater than half thereinforcing profile member height and/or that the first passage heightof the first passage of the first profile limb and the second passageheight of the second passage of the second profile limb are each smallerthan half the reinforcing profile member height. As a result, on the onehand the bending strength or load-bearing capability of the scaffoldingbar can be increased and on the other hand at the same time, from theaspect of convenient manual handling of the scaffolding bar and/or fromthe aspect of fastening of accessory parts with couplings oranti-lifting-off securing of scaffolding floors to be secured againstlifting off from the scaffolding bar, a sufficiently large passageheight of the passages can be realised or ensured.

The first passage height and the second passage height are preferablyeach at least 19 millimetres or at least 25 millimetres or approximately30 millimetres.

According to a particularly preferred variant of embodiment it can beprovided that the first profile limb height of the first profile limb ofthe U reinforcing profile member is greater than 1.0, 1.2 or 1.4 timesthe first passage height of the first passage of the first profile limband/or that the second profile limb height of the second profile limb ofthe U reinforcing profile member is greater than 1.0, 1.2 or 1.4 timesthe second passage height of the second passage of the second profilelimb. As a result, a further improvement in the sense of the precedingadvantages can be achieved.

The second profile limb height of the second profile limb preferablysubstantially corresponds with the first profile limb height of thefirst profile limb.

According to a particularly preferred embodiment it can be provided thatthe first profile limb of the U reinforcing profile member is providedwith at least one third passage for fastening and/or securingscaffolding components, which third passage is arranged at a firstpassage longitudinal spacing—preferably at substantially the same heightas the first passage—from the first passage as considered in the secondlongitudinal direction, and at a fifth longitudinal spacing—preferablysubstantially corresponding with the second longitudinal spacing—fromthe first reinforcing profile member end and at a sixth longitudinalspacing—preferably substantially corresponding with the firstlongitudinal spacing—from the second reinforcing profile member end, andhas a third passage length and a third passage height—preferablysubstantially corresponding with the first passage height of the firstpassage—smaller than the reinforcing profile member height as consideredin the second longitudinal direction, and wherein the second profilelimb of the U reinforcing profile member is provided with at least onefourth passage for fastening and/or securing scaffolding components,which fourth passage is arranged at a second passage longitudinalspacing—preferably substantially corresponding with the first passagelength spacing—from the second passage as considered in the secondlength direction, preferably of substantially the same height as thesecond passage, and at a seventh longitudinal spacing—preferablysubstantially corresponding with the first longitudinal spacing—from thefirst reinforcing profile member end of the U reinforcing profile memberand at an eighth longitudinal spacing—preferably substantiallycorresponding with the sixth longitudinal spacing—from the secondreinforcing profile member end of the U reinforcing profile member, andhas a fourth passage length and a fourth passage height—preferablysubstantially corresponding with the third passage height of the thirdpassage—smaller than the reinforcing profile member height as consideredin the second longitudinal direction. As a result, several fasteningpossibilities for accessory parts with couplings and/or for scaffoldingfloors to be secured against lifting-off are created in the longitudinaldirection along the round-tube girder profile member, with at the sametime a minimised overall weight of the scaffolding bar and with a stillsubstantial bending strength or load-bearing capability of thescaffolding bar.

The first passage and/or the second passage and/or the third passage oreach passage, as considered in the second longitudinal direction, canpreferably be constructed to be longitudinal or elongate and/or formedto be rectangular. Consequently, variable or different fastening and/orsecuring positions for scaffolding components which are to be fastenedand/or secured or which are fastened and/or secured to the scaffoldingbar, particularly to the round-tube girder profile member thereof, canbe realised in longitudinal direction along the round-tube girderprofile member within the respective passage. Moreover, the overallweight of the scaffolding bar can thereby be minimised for a stillsubstantial bending strength or load-bearing capability of thescaffolding bar.

According to a preferred variant of embodiment it can be provided thatthe two lateral profile limbs, which extend substantially parallel toone another, of the U reinforcing profile member are arrangedsymmetrically with respect to a longitudinal plane of symmetrycontaining the first longitudinal axis and the second longitudinal axis.According to a preferred variant of embodiment it can be provided thatthe U reinforcing profile member is formed symmetrically with respect toa longitudinal plane of symmetry containing the first longitudinal axisand the second longitudinal axis. These measures make possible a furtherimproved bending strength or load-bearing capability of the scaffoldingbar and additionally enable further improved storage or stackingconditions, particularly of two scaffolding bars of that kind.

According to an advantageous development it can be provided that the Ureinforcing profile member is produced by flanging, bending over and/orprofiling a plate-shaped or strip-shaped steel sheet on a rolling trainand/or that the base profile of the U reinforcing profile member iscurved outwardly away from the round-tube girder profile member, i.e.convexly, preferably with formation of an inner radius and/or an outerradius, and has a semi-circular cross-section as considered in across-section perpendicular to the second longitudinal axis. Thesemeasures make possible a particularly simple and economic production aswell as an advantageous bending strength or load-bearing capability ofthe scaffolding bar.

The invention also relates to a stack arrangement of at least twoscaffolding bars, comprising a first scaffolding bar according to theinvention and at least one second scaffolding bar according to theinvention, wherein the round-tube girder profile member of the secondscaffolding bar bears against or rests on one profile limb of the twosubstantially parallel profile limbs of the U reinforcing profile memberof the first scaffolding bar and wherein the U reinforcing profilemember of the second scaffolding bar bears or rests by one profile limbof its two substantially parallel profile limbs against or on theround-tube girder profile member of the first scaffolding bar,preferably so that the profile limb axis of the U reinforcing profilemember of the second scaffolding bar and the profile limb axis of the Ureinforcing profile member of the first scaffolding bar extendapproximately in parallel. A stack arrangement of that kind isparticularly space-saving or makes possible a particularly space-savingstorage by stacking of the at least two scaffolding bars according tothe invention against or on one another. In the case of lateral stackingone on the other of several scaffolding bars according to the inventionin a stack arrangement according to the invention an advantageouspositional safety results due a reduced risk of lateral slipping off orslipping to one side of the scaffolding bars—which lie one on top of theother—relative to one another. This signifies an appropriate advantageby comparison with scaffolding bars, of which the reinforcing profilemember has a triangular V cross-section as in the case of the ‘O bar,reinforced’ mentioned in the introduction.

It is particularly advantageous if the scaffolding bars or the firstscaffolding bar and the second scaffolding bar are formed to besubstantially the same. This makes possible particularly advantageousstacking and space conditions.

In that case, according to a particularly preferred variant ofembodiment it can be provided that the profile limb axis of the firstscaffolding bar and the profile limb axis of the second scaffolding barhave a stack spacing from one another which is 0.5 times the sum of theouter diameter and the reinforcing profile member width or of thetransverse spacing. This makes possible further improved stacking andspace conditions.

According to a preferred embodiment it can be provided that theround-tube girder profile member and/or the U reinforcing profile memberconsists or consist of a high-strength steel material. For preference,the round-tube girder profile member and/or the reinforcing profilemember consists or consist of high-strength steel material and/or theround-tube girder profile member and/or the U reinforcing profile memberis or are produced from high-strength steel material. The use of ahigh-strength material of that kind makes possible a substantiallyimproved bending strength or load-bearing capability of the scaffoldingbar produced therefrom.

The respective connecting head can be preferably formed with a head partwhich is upper in the installed setting and a head part which is lowerin the installed setting, between which a slot can be formed, the slotbeing open forwardly and preferably also towards the sides, forhorizontal plugging of the connecting head onto the fastening element,which is provided with a passage or with several passages and which isformed as, for example, a fastening flange, of the scaffolding element.The respective connecting head can have at least one wedge opening,preferably two wedge openings, for insertion or plugging-through of theconnecting wedge. If the connecting head is formed with an upper headpart and with a lower head part and a or the slot therebetween, not onlythe upper head part, but also the lower head part can each have at leastone wedge opening for insertion of the connecting wedge. The connectinghead can be formed with side surfaces which are vertical in theinstalled setting. The slot can preferably also be formed to be opentowards the side surfaces. The side surfaces can include a wedge anglepreferably of 40 to 50 degrees, particularly approximately 44 degrees orapproximately 45 degrees or approximately 46 degrees. The side surfacescan be formed to taper forwardly in the direction of a centre,preferably a post and/or disc centre, of an apertured disc secured tothe scaffolding element, for example post, and/or in the direction of acentre axis of the scaffolding element, preferably scaffolding tube,particularly in the direction of a post axis of a scaffolding post. Theconnecting wedge can preferably be captively secured to the connectinghead, preferably with the help of a securing element, for example arivet, preventing its removal from, particularly withdrawal out of, theconnecting head.

However, it will be obvious that the respective connecting head can alsobe of different design. For example, the connecting head can be providedwith an insertion lug extending transversely, preferably approximatelyperpendicularly, to the first longitudinal axis of the round-tube girderprofile member and downwardly in the installation setting, particularlyto underneath the outer wall or the outer diameter of the round-tubegirder profile member. By way of this insertion lug the connecting headcan be detachably fastened to the fastening element of the scaffoldingelement in vertical direction or in the direction of a passage axis ofthe at least one passage of the fastening element. In other words, aconnecting head of that kind can be so detachably fastenable or fastenedto the fastening element having at least one passage that its insertionlug is inserted in vertical direction through the passage of thefastening element. This is in contrast to the afore-mentioned embodimentof a scaffolding bar in which the respective connecting head has aforwardly open slot, which is horizontal in the installed setting andwhich enables or requires horizontal plugging onto the fastening elementand which accordingly is plugged horizontally onto the fasteningelement, for example the apertured disc.

The fastening element can preferably be a rosette, particularly anapertured disc, of a scaffolding element, preferably of a scaffoldingtube, for example a scaffolding post, the rosette having at least onepassage, preferably several passages arranged offset relative to oneanother in circumferential direction, preferably at the samecircumferential angles, especially at 45 degrees.

It will be obvious that the foregoing features and measures can becombined as desired within the scope of feasibility of the invention.

Further advantages, features and aspects of the invention can beinferred from the following description section, in which a preferredembodiment of the invention is described on the basis of the figures andin which:

FIG. 1 shows a three-dimensional illustration of a scaffolding bar,which is mounted in an installed setting at the apertured discs of twoscaffolding posts of a scaffolding, and installed scaffolding floors;

FIG. 2 shows a side view of the scaffolding bar, wherein forillustration of the installed setting thereof and the mounting thereofon the two scaffolding posts the latter are illustrated with theapertured discs thereof in dot-dashed lines;

FIG. 3 shows the scaffolding bar in a plan view from above;

FIG. 4 shows a cross-section, to substantially enlarged scale, of thescaffolding bar along the section line 4-4 in FIGS. 2 and 3, withoutillustration of the connecting heads; and

FIG. 5 shows a possible stack arrangement of two scaffolding bars.

The scaffolding bar 20 of metal comprises, as fundamental element, anelongate rod-shaped round-tube girder profile member 21 of, preferablygalvanised, steel and an elongate U reinforcing profile member 22 of,preferably galvanised, sheet steel.

The round-tube girder profile member 21 consists of a substantiallystraight and substantially circularly cylindrical round tube. Theround-tube girder profile member 21 extends in the direction of a firstlongitudinal axis 23 in a first longitudinal direction 24 and has twogirder profile member ends 25.1, 25.2 facing away from one another inopposite directions in the first longitudinal direction. The round-tubegirder profile member 21 has, as considered in the first longitudinaldirection 24, a girder profile member length 26 and a girder profilemember longitudinal centre 27 as well as an outer diameter 28 which issubstantially constant over its girder profile member length 26. Theround-tube girder profile member 21 has a substantially constant girderprofile member wall thickness 29 over substantially its entire girderprofile member length 26 or over substantially its entire girder profilemember circumference. The round-tube girder profile member 21 has asupport edge 31, which is upper as considered in an installed setting 40of the scaffolding bar 20, for support and/or suspension of ascaffolding covering 39 or a plurality of scaffolding coverings 39. Arespective separate connecting head 32 of metal, particularly ofmalleable cast iron, grey cast iron, cast steel or steel, for detachablefastening of the scaffolding bar 20 in the installed setting 30 to afastening element 34, which is provided with at least one passage 33.1,33.2, of a scaffolding element 36 by means of a connecting wedge 35insertable through the at least one passage 33.1, 33.2 is fixedly weldedto each girder profile member end 25.1, 25.2 of the girder profilemember ends 25.1, 25.2.

As illustrated in FIGS. 1 to 3, the scaffolding bar 20 can be fastenedby way of each of its two connecting heads 32, 32 in a mode and mannerknown per se to a respective apertured disc 34 of a scaffolding post 36with the help of a respective connecting wedge 35. As similarly showntherein, several scaffolding floors 39 can be fixed, adjacent to oneanother as considered in the first longitudinal direction 24, to or onthe scaffolding bar 20 in a mode and manner similarly known per se, forexample by means of the illustrated suspension hooks or claws 37.

The U reinforcing profile member 22 extends in the direction of a secondlongitudinal axis 43 in a second longitudinal direction 44 parallel tothe round-tube girder profile member 21 or parallel to the firstlongitudinal axis 23 thereof—with bridging-over of the girder profilemember longitudinal centre 27—continuously along the round-tube girderprofile member 21 over a reinforcing profile member length 45corresponding with at least half the girder profile member length 26 ofthe round-tube girder profile member 21. In the illustrated embodiment,the girder profile member length 26 is approximately 940 millimetres andthe reinforcing profile member length 45 approximately 720 millimetres.The U reinforcing profile member 21 is arranged to be centrally centredrelative to the round-tube girder profile member 21 as considered in thefirst longitudinal direction 24. Accordingly, the round-tube girderprofile member 21 extends by each of its girder profile member ends25.1, 25.2, as considered in the first longitudinal direction 24, outbeyond the respective reinforcing profile member end 47.1, 47.2 of the Ureinforcing profile member 22. In the illustrated example the respectivegirder profile member end 25.1, 25.2 of the round-tube girder profilemember 21 has a spacing 46 in each instance from the respectivelyassociated reinforcing profile member end 47.1, 47.2 of the Ureinforcing profile member 22 as considered in the first longitudinaldirection 24. This spacing 46 is preferably approximately 110.0millimetres. However, it will be obvious that the spacing can also besmaller or larger. The U reinforcing profile member 22 is a profilemember which is straight with respect to the second longitudinaldirection 44. The U reinforcing profile member 22 has two reinforcingprofile member ends 47.1, 47.2 facing away from one another in oppositedirections. The U reinforcing profile member 22 extends away from theround-tube girder profile member 21, in the installed setting 30 tobelow the round-tube girder profile member 21. The U reinforcing profilemember 22 has, as considered in a cross-section extendingperpendicularly to the second longitudinal axis 43, a U-shapedcross-section 48 (see, in particular, FIG. 4). The U reinforcing profilemember 22 comprises a base profile 49 extending rectilinearly in thesecond longitudinal direction 44 and two lateral profile limbs 50.1,50.2. The profile limbs 50.1. 50.2 extend away from the base profile 49in the same direction, which is upward as considered in the installedsetting, at a transverse spacing 52 from one another and substantiallyparallel to one another in the direction of a profile limb axis 51 whichis vertical in the installed setting 30. The base profile 49 is curvedoutwardly away from the round-tube girder profile member 21, i.e.convexly, with formation of an inner radius 53 or with an inner radius53. The inner radius 53 is, for example, 7 millimetres. In across-section considered perpendicularly to the second longitudinal axis44 the base profile 49 has a semi-circular cross-section 54. The twolateral profile limbs 50.1, 50.2 extend in the second longitudinaldirection 44 substantially parallel to one another. A first profile limb50.1 of the two profile limbs 50.1, 50.2 has a first fastening end 55.1facing away from the base profile 49. A second profile limb 50.2 of thetwo profile limbs 50.1, 50.2 has a second fastening end 55.2 facing awayfrom the base profile 49. The first fastening end 55.1 of the firstprofile limb 50 has a first spacing 56 from the base profile 49 and thesecond fastening end 55.2 of the second profile limb 50.2 has a secondspacing from the base profile 49, the second spacing being the same sizeas the first spacing 56. Each profile limb 50.1, 50.2 of the two profilelimbs 50.1, 50.2 is fixedly welded by its fastening end 55.1, 55.2,which faces away from the base profile 49, to the circularly cylindricalouter wall 38 of the round-tube girder profile member 21. The outer wall38 can also be termed outer circumferential wall. The two profile limbs50.1, 50.2 extend, as considered in a cross-section perpendicular to thesecond longitudinal axis 43, parallel to one another at the transversespacing 52. The U reinforcing profile member 22 has a U reinforcingprofile member width 52 corresponding with the transverse spacing 52 anda reinforcing profile member height 56 corresponding with the spacing 56of the fastening ends 55.1, 55.2 from the base profile 49. Thereinforcing profile member height 56 is greater than the reinforcingprofile member width 52 and is also greater than the outer diameter 28of the round-tube girder profile member 21.

The transverse spacing 52 of the two lateral profile limbs 50.1, 50.2,which extend substantially parallel to one another or the reinforcingprofile member width 52 of the U reinforcing profile member 22 is or aresmaller than 0.6 times the outer diameter 28 of the round-tube girderprofile member 21. In the illustrated embodiment the transverse spacing52 or the U reinforcing profile member width 52 is approximately 20.0millimetres. The outer diameter 28 of the round-tube girder profilemember 21 is approximately 48.3 millimetres. Accordingly, in theillustrated embodiment the quotient or the ratio of the transversespacing 52 or the U reinforcing profile member width 52 and the outerdiameter 28 of the round-tube girder profile member 21 is approximately0.41. The wall thickness of the round-tube girder profile member 29 ishere approximately 2.7 millimetres. The wall thickness 57 of the profilelimbs 50.1, 50.2 of the U reinforcing profile member 22 is hereapproximately 3.0 millimetres.

The first profile limb 50.1 of the two lateral profile limbs 50.1, 50.2is provided with two elongate rectangular passages 60.1, 60.3, whicheach extend in the second longitudinal direction 44, for fasteningand/or securing scaffolding components; which are not shown in thefigures. A first passage 60.1 of the two passages 60.1, 60.3 is arrangedat a first longitudinal spacing 61.1 from the first reinforcing profilemember end 47.1 of the U reinforcing profile member 22 and at a secondlongitudinal spacing from the second reinforcing profile member end 47.2of the two U reinforcing profile member ends 47.1, 47.2 of the Ureinforcing profile member 22. The other passage 60.3, which is alsotermed third passage, of the two passages 60.1, 60.3 of the firstprofile limb 50.1 is arranged at a fifth longitudinal spacing, whichsubstantially corresponds with the second longitudinal spacing, from thefirst reinforcing profile member end 47.1 and at a sixth longitudinalspacing 61.6, which substantially corresponds with the firstlongitudinal spacing 61.1, from the second reinforcing profile memberend 47.2. The first passage 60.1 and the other or third passage 60.3 arearranged at a first passage longitudinal spacing 62.1 from one anotherat substantially the same height and are each bounded—upwardly in theinstalled setting 30—by the outer wall 38, which is straight asconsidered in the first longitudinal direction 24, of the round-tubegirder profile member 21.

The second profile limb 50.2 of the two lateral profile limbs 50.1, 50.2is also provided with two elongate rectangular passages 60.2, which eachextend in the second longitudinal direction 44, for fastening and/orsecuring scaffolding components (not shown in the figures) or the saidscaffolding components. One passage of these two passages, which is alsotermed second passage 60.2, is arranged at a third longitudinal spacing,which substantially corresponds with the first longitudinal spacing61.1, from the first reinforcing profile member end 47.1 of the Ureinforcing profile member 22 and is arranged at a fourth longitudinalspacing, which substantially corresponds with the second longitudinalspacing, from the second reinforcing profile member end 47.2. The otherpassage of these two passages 60.2, which is also termed fourth passage,is arranged at a seventh longitudinal spacing, which substantiallycorresponds with the fifth or second longitudinal spacing, from thefirst reinforcing profile member end 47.1 of the U reinforcing profilemember 22. Moreover, the fourth passage is arranged at an eighthlongitudinal spacing, which substantially corresponds with the sixth orfirst longitudinal spacing, from the second U reinforcing profile memberend 47.2 of the U reinforcing profile member 22. The one passage or thesecond passage 60.2 and the other passage or fourth passage are arrangedat a second passage longitudinal spacing from one another at the sameheight and are each bounded, upwardly in the installed setting 30, bythe outer wall 38, which is straight as considered in the firstlongitudinal direction 24, of the round-tube girder profile member 21.The second passage longitudinal spacing is substantially the same sizeas the first passage longitudinal spacing 62.1. The first passagelongitudinal spacing 62.1 and the second passage longitudinal spacingare here each approximately 34 millimetres. The first, third, sixth andeighth longitudinal spacings are here each approximately 80 millimetres.The second, fourth, fifth and seventh longitudinal spacings are hereeach approximately 377 millimetres.

Each of the four passages 60.1, 60.2, 60.3 has, as considered in adirection perpendicular to the second longitudinal direction 44, apassage height 63 of substantially the same size and, as considered in asecond longitudinal direction 44, a passage length 64 of substantiallythe same size. The respective passage length 64 is here approximately263 millimetres. However, it will be obvious that each passage,particularly in the case of longer scaffolding bars, can also have adifferent passage length, for example approximately 158 millimetres orapproximately 286 millimetres or approximately 478 millimetres. Inaddition, it will be obvious that each profile limb can also have morethan two passages, in particular three to eight passages. If eachprofile limb has more than two passages, the passages closest to therespective reinforcing profile member ends preferably have a passagelength respectively corresponding with the passage length 64, thusapproximately 263 millimetres.

Each of the four passages 60.1, 60.2, 60.3 has a passage cross-sectionof substantially the same size. The passage height 63 of each passage60.1, 60.2, 60.3 is smaller than the reinforcing profile member height56. As considered in a viewing direction perpendicular to a plane 65containing the first longitudinal axis 23 and the second longitudinalaxis 43 not only are the first passage 60.1 of the first profile limb50.1 and the second passage 60.2 of the second profile limb 50.2 inalignment, but also the third passage 60.3 of the first profile limb50.1 and the fourth passage of the second profile limb 50.2 arerespectively arranged to be substantially congruent or arranged as arespective pair to be substantially congruent. Each of the four passages60.1, 60.2, 60.3 is, as considered in a viewing direction perpendicularto the plane or longitudinal plane of symmetry 65 containing the firstlongitudinal axis 23 and the second longitudinal axis 43, bounded orenclosed over the whole circumference by wall parts of the respectiveprofile limb 50.1, 502 of the U reinforcing profile member 22 and by awall part of the outer wall 38 of the round-tube girder profile member21.

The two profile limbs 50.1, 50.2 of the U reinforcing profile member 22each have in the region of the passages 60.1, 60.3; 60.2 thereof aprofile limb height 66 which is of substantially the same size and whichis larger than half the reinforcing profile member height 56.Accordingly, the respective passage height 63 of the passages 60.1,60.3; 60.2 of the two profile limbs 50.1, 50.2 of the U reinforcingprofile member 22 is in each instance smaller than half the reinforcingprofile member height 56. The passage heights 63 of the passages 60.1,60.3; 60.2 are of substantially the same size. In the illustratedembodiment the respective passage height 63 is approximately 30.0millimetres. The profile limb height 66, which the profile limbs 50.1,50.2 of the U reinforcing profile member 22 each have in the region ofthe passages 60.1, 60.3; 60.2, is here approximately 43.0 millimetres.In the illustrated embodiment, the reinforcing profile member height 56is approximately 73.0 millimetres.

In the illustrated embodiment the scaffolding bar 20 is configured orformed symmetrically with respect to a longitudinal plane 65 ofsymmetry, which contains the first longitudinal axis 23 and the secondlongitudinal axis 43 and also symmetrically with respect to a transverseplane 67 of symmetry containing the girder profile member longitudinalcentre 27 of the round-tube girder profile member 21. Accordingly, the Ureinforcing profile member 22 and thus also the two lateral profilelimbs 50.1, 50.2, which extend substantially parallel to one another, ofthe U reinforcing profile member 22 are configured or formedsymmetrically with respect to the longitudinal plane 65 of symmetry andalso symmetrically with respect to the transverse plane 67 of symmetry.The two profile limbs 50.1, 50.2, which are formed and arrangedsymmetrically with respect to the longitudinal plane 65 of symmetry, ofthe U reinforcing profile member 22 of the scaffolding bar 20 extendparallel to one another on either side of the longitudinal plane 65 ofsymmetry and thus on either side of a profile limb axis 51, which isformed perpendicularly to the second longitudinal axis 43, of the Ureinforcing profile member 22.

The two profile limbs 50.1, 50.2 of the U reinforcing profile member 22are each arranged to be offset by the fastening ends 55.1, 55.2 thereoflaterally relative to the longitudinal plane 65 of symmetry by anidentical spacing corresponding with half the transverse spacing 52 orhalf the U reinforcing profile member width 52. Accordingly, the profilelimbs 50.1, 50.2 of the U reinforcing profile member 22 are notseated—and thus neither is the U reinforcing profile member 22—at thelowest point of the round-tube girder profile member 21 in the installedsetting 30, but are offset from the centre point 40 of the round-tubegirder profile member 21 or from the longitudinal plane 25 of symmetryto both sides. Thus, an effective reinforcing profile member height 68,which is slightly smaller by a spacing or an amount 69 than thereinforcing profile member height 56, results and an effective passageheight 70, which is smaller by the same spacing or amount 69 than therespective passage height 63, of the respective passage 60.1, 60.3; 60.2results. The effective reinforcing profile member height 68 is hereapproximately 71.96 millimetres. The effective passage height 70 is hereapproximately 28.96 millimetres. Accordingly, the effective reinforcingprofile member height 68 is reduced by comparison with the reinforcingprofile member height 56 by the spacing or amount 69 of approximately1.04 millimetres. The scaffolding bar 20 therefore has an overall height71 corresponding with the sum of the outer diameter 28 of the round-tubegirder profile member 21 and the effective reinforcing profile memberheight 68. The overall height 71 is here calculated to be approximately120.26 millimetres (see FIG. 4). In addition, the effective passageheight 70 is reduced by comparison with the passage height 63 by theamount 69 of approximately 1.04 millimetres.

The U reinforcing profile member 22 is preferably produced by flanging,bending over and or profiling a plate-shaped or strip-shaped, preferablyflat-plane, steel sheet or steel-sheet semi-finished product (not shownin the figures) about a single flanging or bending axis on a rollingtrain.

The scaffolding bar 20 according to the invention offers an advantageouspossibility for the fastening of accessory components which are, inparticular, already present and which are not shown in the figures,particularly standardised, preferably integrated, couplings in a lengthregion of the round-tube girder profile member 21, in which the Ureinforcing profile member 22 also extends, and/or for an anti-lift-offsecuring of at least one scaffolding floor 39, which rests on or issuspended at the round-tube girder profile member 21 and which is, inparticular, present, by means of a securing bar (not shown in thefigures) which is at the underside of the or the respective scaffoldingfloor 39 and pivotable relative thereto about a pivot axis arrangedtransversely, particularly perpendicularly, to the work surface of thescaffolding floor 39.

A stack arrangement 75 of two scaffolding bars 20 according to theinvention, comprising a first scaffolding bar 20.1 and a secondscaffolding bar 20.2, is shown in FIG. 5. The first scaffolding bar 20.1and the second scaffolding bar 20.2 are of the same form. In otherwords, the stack arrangement shows two identical scaffolding bars 20.

In the stack arrangement 75 shown in FIG. 5 the second scaffolding bar20.2 is arranged to be turned relative to the first scaffolding bar 20.1through 180 degrees about the first longitudinal axis 23 of the firstscaffolding bar 20.1 in such a way that as considered in a cross-sectionperpendicular to the first or second longitudinal axis 23 or 43 of thefirst scaffolding bar 20.1, the ends 76, which are formed or bounded bythe respective base profile 49 of the respective U reinforcing profilemember 22, of the respective U reinforcing profile member 22 face awayfrom one another in opposite directions or that the U reinforcingprofile member 22 of the first scaffolding bar 20.1 faces away from theround-tube girder profile member 21 thereof and the reinforcing profilemember 22 of the second scaffolding bar 20.2 faces away from theround-tube girder profile member 21 thereof in opposite directions.

The round-tube girder profile member 21 of the second scaffolding bar20.2 lies against or on a profile limb 50.1 of the two substantiallyparallel profile limbs 50.1, 50.2 of the U reinforcing profile member 22of the first scaffolding bar 20.1 and the U reinforcing profile member22 of the second scaffolding bar 20.2 lies by one profile limb 50.1 ofits two substantially parallel profile limbs 50.1, 50.2 against or onthe round-tube girder profile member 21 of the first scaffolding bar20.1 so that the profile limb axis 51 of the U reinforcing profilemember 22 of the second scaffolding bar 20.2 and the profile limb axis51 of the U reinforcing profile member 22 of the first scaffolding bar20.1 extend approximately parallelly (see FIG. 5). A stack arrangement75 of that kind is particularly space-saving or makes possible aparticularly space-saving storage by stacking of the at least twoscaffolding bars 20; 20.1, 20.2 according to the invention against or onone another. The profile limb axis 51 of the first scaffolding bar 20.1and the profile limb axis 51, which is parallel thereto, of the secondscaffolding bar 20.2 have a stack spacing 77 from one another which is0.5 times or half the sum of the outer diameter 28 of the respectiveround-tube girder profile member 21 and the reinforcing profile memberwidth 52 of the respective U reinforcing profile member 22 or of thetransverse spacing 52 of the respective profile limbs 50.1, 50.2 of therespective U reinforcing profile member 22. In the illustratedembodiment the said stack spacing 77 is approximately only 34.15millimetres.

REFERENCE NUMERAL LIST

-   20 scaffolding bar-   20.1 (first) scaffolding bar-   20.2 (second) scaffolding bar-   21 round-tube girder profile member/round tube-   22 U reinforcing profile member-   23 first longitudinal axis of 21-   24 first longitudinal direction-   25.1 (first) girder profile member end-   25.2 (second) girder profile member end-   26 girder profile member length-   27 girder profile member longitudinal centre-   28 outer diameter of 21-   29 (girder profile member) wall thickness-   30 installed setting-   31 (upper) support edge of 21-   32 connecting head-   33.1 passage-   33.2 passage-   34 fastening element/rosette/apertured disc-   35 connecting wedge-   36 scaffolding element/scaffolding post-   37 suspension hook/suspension claw-   39 scaffolding covering/scaffolding floor-   40 centre point-   43 second longitudinal axis of 22-   44 second longitudinal direction-   45 reinforcing profile member length-   46 spacing (110)-   47.1 (first) reinforcing profile member end/longitudinal end-   47.2 (second) reinforcing profile member end/longitudinal end-   48 U-shaped cross-section-   49 base profile-   50.1 (first) profile limb-   50.2 (second) profile limb-   51 profile limb axis-   22 transverse spacing/reinforcing profile member width-   53 inner radius-   54 (semi-circular) cross-section-   55.1 (first) fastening end of 50.1-   55.2 (second) fastening end of 50.2-   56 spacing/U profile member height-   57 (reinforcing profile member) wall thickness-   60.1 (first) passage-   60.2 (second) passage-   60.3 (third) passage-   61.1 (first) longitudinal spacing-   61.6 (sixth) longitudinal spacing-   62.1 (first) passage longitudinal spacing-   63 passage height-   64 passage length-   65 (longitudinal) plane (of symmetry)-   66 profile limb height-   67 (transverse) plane (of symmetry)-   68 effective reinforcing profile member height-   69 spacing/amount-   70 effective passage height-   71 overall height-   75 stack arrangement-   76 stack spacing

1. Scaffolding bar of metal with an elongate rod-shaped round-tubegirder profile member (21) of steel and an elongate U reinforcingprofile member (22) of sheet steel, with the following features: theround-tube girder profile member (21) extends in the direction of afirst longitudinal axis (23) in a first longitudinal direction (24),has, as considered in the first longitudinal direction (24), a girderprofile member length (26) and a girder profile member longitudinalcenter (24), has an outer diameter (28) substantially constant over itsgirder profile member length (26), has, as considered in an installedsetting (30) of the scaffolding bar (20), an upper support edge (31) forsupport and/or suspension of a scaffolding covering (39) or a pluralityof scaffolding coverings (39) and comprises two girder profile memberends (25.1, 25.2) facing away from one another in opposite directions inthe first longitudinal direction (24); either a respective separateconnecting head (32) of metal for detachable fastening of thescaffolding bar (20) in the installed setting (30) to a fasteningelement (34), which is provided with at least one passage (33.1, 33.2),of a scaffolding element (36) by means of a connecting wedge (35)insertable through the passage (33.1, 33.2) is fixedly welded to eachgirder profile member end (25.1, 25.2) of the girder profile member ends(25.1, 25.2) or a respective hook-shaped suspension claw or suspensioncatch of metal, which is downwardly open as considered in each instancein the installed setting, for detachable support and/or suspension ofthe scaffolding bar in the installed setting on and/or at suspensioncomponents is fixedly welded to each girder profile end of the girderprofile ends; the U reinforcing profile member (22) extends away fromthe round-tube girder profile member (21) to underneath the round-tubegirder profile member (21) in the installed setting, extends in thedirection of a second longitudinal axis (43) in a second longitudinaldirection (44) parallel to the round-tube girder profile member (21)and/or parallel to the first longitudinal axis (23) thereof—withbridging-over of the girder-profile member longitudinal center(27)—along the round-tube girder profile member (21) continuously over areinforcing profile member length (45) corresponding with at least halfthe girder profile member length (26) of the round-tube girder profilemember (21), has two reinforcing profile member ends (47.1, 47.2) facingaway from one another in opposite directions in the second longitudinaldirection (44), has, as considered in a cross-section extendingperpendicularly to the second longitudinal axis (43), a U-shapedcross-section (48), is formed with a base profile (49), which extends inthe second longitudinal direction (44) and from which two lateralprofile limbs (50.1, 50.2) extending in the second longitudinaldirection (44) extend away in the same direction upwardly as consideredin the installed setting (30) and substantially parallel to one anotherat a transverse spacing (52) and in the direction of a profile limb axis(51), which is vertical in the installed setting (30), and havefastening ends (55.1, 55.2) fixedly welded to an outer wall of theround-tube girder profile member (21) and has a reinforcing profilemember width (52) corresponding with the transverse spacing (52) and areinforcing profile member height (56), which corresponds with thespacing (56) of the fastening ends (55.1, 55.2) from the base profile(49) and which is greater than the reinforcing profile member width (52)and than the outer diameter (28) of the round-tube girder profile member(21); a first profile limb (50.1) of the two lateral profile limbs(50.1, 50.2) is provided with a first passage (60.1) for fasteningand/or securing scaffolding components; the first passage (60.1) isarranged at a first longitudinal spacing (61.1) from a first reinforcingprofile member end (47.1) of the two reinforcing profile member ends(47.1, 47.2) of the U reinforcing profile member (22) and at a secondlongitudinal spacing from a second reinforcing profile member end (47.2)of the two reinforcing profile member ends (47.1, 47.2) of the Ureinforcing profile member (22), has a first passage length (64) asconsidered in the second longitudinal direction (44) and has a firstpassage height (63) which is smaller than the reinforcing profile memberheight (56); a second profile limb (50.2) of the two lateral profilelimbs (50.1, 50.2) is provided with a second passage (60.2) forfastening and/or securing scaffolding components; the second passage(60.2) is arranged at a third longitudinal spacing from the firstreinforcing profile member end (47.1) of the U reinforcing profilemember (22) and at a fourth longitudinal spacing from the secondreinforcing profile member end (47.2), has a second passage length (64)as considered in the second longitudinal direction (44) and has a secondpassage height (63) smaller than the reinforcing profile member height(56); the transverse spacing (52), which corresponds with thereinforcing profile member width (52) of the U reinforcing profilemember (22), of the two lateral profile limbs (50.1, 50.2) extendingsubstantially parallel to one another is less than 0.6 times the outerdiameter (28) of the round-tube girder profile member (21). 2.Scaffolding bar according to claim 1, wherein the transverse spacing(52), which corresponds with the reinforcing profile member width (52)of the U reinforcing profile member (22), of the two lateral profilelimbs (50.1, 50.2) extending substantially parallel to one another isless than 0.5 or 0.45 times the outer diameter (28) of the round-tubegirder profile member (21).
 3. Scaffolding bar according to claim 1,wherein the first passage (60.1) of the first profile limb (50.2) andthe second passage (60.2) of the second profile limb (50.2) are arrangedat substantially the same height with respect to the U reinforcingprofile member (22).
 4. Scaffolding bar according to claim 1, whereinthe first passage (60.1) of the first profile limb (50.1) and the secondpassage (60.2) of the second profile limb (50.2) are bounded by theouter wall of the round-tube girder profile member (21).
 5. Scaffoldingbar according to claim 1, wherein the first passage (60.1) of the firstprofile limb (50.1) as considered in a viewing direction perpendicularto a plane (65) containing the first longitudinal axis (23) and thesecond longitudinal axis (43) either at least partly overlaps the secondpassage (60.2) of the second profile limb (50.2) or is substantiallyaligned with the second passage (60.2).
 6. Scaffolding bar according toclaim 1, wherein the first profile limb (50.1) of the U reinforcingprofile member (22) has in the region of the first passage (60.1) afirst profile limb height (66) which is greater than half thereinforcing profile member height (56) and wherein the second profilelimb (50.2) of the U reinforcing profile member (22) has in the regionof the second passage (60.2) a second profile limb height (66) which isgreater than half the reinforcing profile member height (56). 7.Scaffolding bar according to claim 1, wherein the first passage height(63) of the first passage (60.1) of the first profile limb (50.1) andthe second passage height (63) of the second passage (60.2) of thesecond profile limb (50.2) are each smaller than half the reinforcingprofile member height (56).
 8. Scaffolding bar according to claim 1,wherein the first profile limb height (66) of the first profile limb(50.1) of the U reinforcing profile member (22) is greater than 1.0, 1.2or 1.4 times the first passage height (63), of the first passage (60.1)of the first profile limb (50.1) and/or wherein the second profile limbheight (66) of the second profile limb (50.2) of the U reinforcingprofile member (22) is greater than 1.0, 1.2 or 1.4 times the secondpassage height (63) of the second passage (60.2) of the second profilelimb (50.2).
 9. Scaffolding bar according to claim 1, comprising thefollowing further features: the first profile limb (50.1) of the Ureinforcing profile member (22) is provided with at least one thirdpassage (60.3) for fastening and/or securing scaffolding components, thethird passage (60.3) is arranged at a first passage longitudinal spacing(62.1) from the first passage (60.1) as considered in the secondlongitudinal direction (44), is arranged at a fifth longitudinal spacingfrom the first reinforcing profile member end (47.1) and at a sixthlongitudinal spacing (61.6) from the second reinforcing profile memberend (47.2), has a third passage length as considered in the secondlongitudinal direction (44) and has a third passage height (63) smallerthan the reinforcing profile member height (56); the second profile limb(50.2) of the U reinforcing profile member (22) is provided with atleast one fourth passage for fastening and/or securing scaffoldingcomponents; the fourth passage is arranged at a second passagelongitudinal spacing from the second passage (60.2) as considered in thesecond length direction (44), is arranged at a seventh longitudinalspacing from the first reinforcing profile member end (47.1) of the Ureinforcing profile member (22) and at an eighth longitudinal spacingfrom the second reinforcing profile member end (47.2) of the Ureinforcing profile member (22), has a fourth passage length asconsidered in the second longitudinal direction (44) and has a fourthpassage height (63) smaller than the reinforcing profile member height(56).
 10. Scaffolding bar according to claim 1, wherein each passage(60.1, 60.2, 60.3) as considered in the second longitudinal direction(44) is constructed to be longitudinal or elongate and/or is formed tobe rectangular.
 11. Scaffolding bar according to claim 1, wherein thetwo lateral profile limbs (50.1, 50.2), which extend substantiallyparallel to one another, of the U reinforcing profile member (22) arearranged symmetrically with respect to a longitudinal plane (65) ofsymmetry containing the first longitudinal axis (23) and the secondlongitudinal axis (43).
 12. Scaffolding bar according to claim 1,wherein the U reinforcing profile member (22) is formed symmetricallywith respect to a or the longitudinal plane (65) of symmetry containingthe first longitudinal axis (23) and the second longitudinal axis (43).13. Scaffolding bar according to claim 1, wherein the U reinforcingprofile member (22) is produced by flanging, bending over and/orprofiling a plate-shaped or strip-shaped steel sheet on a rolling trainand/or wherein the base profile (49) of the U reinforcing profile member(22) is curved outwardly away from the round-tube girder profile member(21) and has a semi-circular cross-section as considered in across-section perpendicular to the second longitudinal axis (43). 14.Stack arrangement of at least two scaffolding bars comprising a firstscaffolding bar (20; 20.1) according to claim 1 and at least one secondscaffolding bar (20; 20.1), wherein the round-tube girder profile member(21) of the second scaffolding bar (20.2) bears against or rests on oneprofile limb (50.1) of the two substantially parallel profile limbs(50.1, 50.2) of the U reinforcing profile member (22) of the firstscaffolding bar (20.1) and wherein the U reinforcing profile member (22)of the second scaffolding bar (20.2) bears or rests by one profile limb(50.1) of its two substantially parallel profile limbs (50.1, 50.2)against or on the round-tube girder profile member (21) of the firstscaffolding bar (20.1).
 15. Stack arrangement according to claim 14,wherein the first scaffolding bar (20; 20.1) and the second scaffoldingbar (20; 20.1) are formed to be the same.